Plan a flight · Mon 1:10 am EDT (05:10 UTC)

James M Cox Dayton International to Seattle-Tacoma International DAY → SEA

1,696 nautical miles (1,952 statute miles) northwest on a straight line, true course 298°, about 304° magnetic at the departure end (variation 6W). At 120 knots that is 14 h 01 min at the quickest height in today's winds (4,500 ft, a 1-knot tailwind), arriving about 12:11 pm PDT (19:11 UTC). Right now DAY is marginal VFR, wind from the west (280°) at 4 knots; SEA is VFR, wind from the east (090°) at 6 knots. For planning, not a briefing: the legal preflight briefing comes from Flight Service (1-800-WX-BRIEF) or the FAA's own tools. Airlines fly this pair: 2 flights in the DOT's last twelve reported months, the route's page.

The route the straight line, the warnings crossed, restrictions, pilot reports and the airports along the way · click a mark for its words

Green, blue, red and purple airport dots are the flying conditions reported there now (VFR, marginal VFR, IFR, low IFR); grey means no report. Red areas are SIGMETs, orange areas AIRMETs, hatched red areas temporary flight restrictions. Map tiles: OpenFreeMap, data © OpenStreetMap contributors.

Warnings the route crosses SIGMETs and AIRMETs whose area the line passes through or comes within 25 nm of

AIRMET SIERRA 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the first 150 nm of the route.
AIRMET TANGO 3W: low-level wind shear (due to air speed loss or gain of 20 knots or more below 2,000 ft above the ground). Over the route from 309 to 499 nm out.
AIRMET SIERRA 4E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the route from 599 to 1427 nm out.
AIRMET TANGO 1W: low-level wind shear (due to air speed loss or gain of 20 knots or more below 2,000 ft above the ground). Near the route, 958 nm along the route.
AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 998 to 1008 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 1008 to 1088 nm out.
AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 1098 to 1577 nm out.
AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 1138 to 1457 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 1237 to 1427 nm out.
AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the last 180 nm of the route.

A SIGMET warns of weather hazardous to all aircraft; an AIRMET of weather that matters to small aircraft and to flying without instruments. "From 60 to 180 nm out" is measured along the route from DAY.

Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first

LJ45 at 10,000 ft, 44 nm northeast, 12:31 am EDT (04:31 UTC): no turbulence, clear, remarks: ground fog at fwa FV10SM on final runway 14. 90 nm along the route, 44 nm northeast of the line.
as filed, and in English
```
FWA UA /OV OLK/TM 0431/FL100/TP LJ45/SK CLR/TB SMOOTH/RM GROUND FOG AT FWA. FV10SM ON FINAL RY 14
```
Report
a routine report filed through FWA
Where
over OLK
Time
04:31 UTC
Height
at 10,000 ft
Aircraft
LJ45
Sky
clear
Turbulence
smooth
Remarks
ground fog at fwa FV10SM on final runway 14
B38M at 29,000 ft, 46 nm southwest, 12:52 am EDT (04:52 UTC): no turbulence from 23,000 ft to 29,000 ft. 180 nm along the route, 46 nm southwest of the line.
as filed, and in English
```
TIP UA /OV RBS/TM 0452/FL290/TP B38M/TB NEG 230-290
```
Report
a routine report filed through TIP
Where
over RBS
Time
04:52 UTC
Height
at 29,000 ft
Aircraft
B38M
Turbulence
no from 23,000 ft to 29,000 ft
CL30 at 4,200 ft, 7 nm southwest, 11:16 pm EDT (03:16 UTC): no icing, overcast above 4,200 ft, remarks: during the descent ils runway 12. 1357 nm along the route, 7 nm southwest of the line.
as filed, and in English
```
MSO UA /OV MSO/TM 0316/FL042/TP CL30/SK OVC042/WX 2 1/2SM/IC NEG/RM DURD ILS RY 12
```
Report
a routine report filed through MSO
Where
over MSO
Time
03:16 UTC
Height
at 4,200 ft
Aircraft
CL30
Sky
overcast from 4,200 ft
Weather
2, 1/2SM
Icing
none
Remarks
during the descent ils runway 12

Winds aloft along the route, and the time en route the forecast for use 02:00–09:00 UTC · at 120 knots true airspeed

The westbound cruising heights for this course (VFR: even thousands plus 500 ft; above 18,000 ft the forecast levels), with the wind averaged along the line from the 17 forecast points nearest it (FWA, JOT, DBQ, MCW, FSD, ABR, PIR, RAP, DIK, MLS, BIL, GTF, GPI, LWS, GEG, YKM, SEA). A plus sign is a headwind, a minus sign a tailwind.

Height	Average wind	Head- or tailwind	Temperature	Ground speed	Time en route	Arrival
4,500 ft	200° at 7 kt	−1 kt	6 °C	121 kt	14 h 01 min	12:11 pm PDT (19:11 UTC)
6,500 ft	210° at 6 kt	+1 kt	10 °C	119 kt	14 h 15 min	12:25 pm PDT (19:25 UTC)
8,500 ft	210° at 6 kt	+1 kt	7 °C	119 kt	14 h 15 min	12:25 pm PDT (19:25 UTC)
10,500 ft	220° at 9 kt	+3 kt	2 °C	117 kt	14 h 30 min	12:40 pm PDT (19:40 UTC)
12,500 ft	220° at 13 kt	+5 kt	-1 °C	115 kt	14 h 45 min	12:55 pm PDT (19:55 UTC)
14,500 ft	230° at 15 kt	+8 kt	-5 °C	112 kt	15 h 09 min	1:19 pm PDT (20:19 UTC)
16,500 ft	240° at 17 kt	+11 kt	-8 °C	109 kt	15 h 34 min	1:44 pm PDT (20:44 UTC)
18,000 ft FL180	240° at 19 kt	+13 kt	-11 °C	107 kt	15 h 51 min	2:01 pm PDT (21:01 UTC)
24,000 ft FL240	240° at 21 kt	+15 kt	-23 °C	105 kt	16 h 09 min	2:19 pm PDT (21:19 UTC)
30,000 ft FL300	250° at 25 kt	+20 kt	-36 °C	100 kt	16 h 58 min	3:08 pm PDT (22:08 UTC)
34,000 ft FL340	260° at 37 kt	+34 kt	-41 °C	86 kt	19 h 43 min	5:53 pm PDT (00:53 UTC)
39,000 ft FL390	260° at 45 kt	+42 kt	-47 °C	78 kt	21 h 45 min	7:55 pm PDT (02:55 UTC)

Based on data from the 12th at 00:00 UTC; valid on the 12th at 06:00 UTC for use 02:00 to 09:00 UTC; temperatures above 24,000 ft are below zero. Heights are above sea level; a height is left out when the forecast has no wind for it over most of the line (the ground is higher). Ground speed is the airspeed less the headwind; the time en route is for the straight line and ignores climb, descent and routing around weather.

The forecast points as issued

Point	From	3,000	6,000	9,000	12,000	18,000	24,000	30,000	34,000	39,000
FWA	used from 0 nm out; 58 nm from the line	300/17	320/20 16°	330/20 10°	340/15 3°	310/27 -8°	320/37 -20°	330/52 -36°	330/65 -43°	330/60 -50°
JOT	used from 150 nm out; 30 nm from the line	250/23	270/22 15°	250/16 10°	240/9 4°	280/22 -7°	280/29 -19°	300/29 -34°	290/50 -43°	300/64 -52°
DBQ	used from 249 nm out; 55 nm from the line	230/33	250/30 16°	280/15 9°	260/15 5°	260/21 -7°	260/24 -20°	250/37 -33°	270/42 -43°	280/63 -52°
MCW	used from 399 nm out; 29 nm from the line	220/44	250/30 17°	230/14 12°	240/17 6°	250/22 -8°	270/29 -20°	250/34 -34°	260/52 -43°	260/59 -51°
FSD	used from 549 nm out; 39 nm from the line	190/9	230/30 18°	240/23 13°	240/20 6°	260/22 -9°	250/31 -21°	250/43 -36°	260/49 -43°	270/53 -47°
ABR	used from 649 nm out; 64 nm from the line	070/14	250/10 17°	270/16 11°	260/28 5°	260/36 -10°	260/41 -22°	270/33 -37°	260/42 -42°	260/50 -48°
PIR	used from 699 nm out; 49 nm from the line		170/22 19°	190/25 13°	210/32 6°	240/23 -9°	250/32 -21°	250/38 -36°	260/44 -40°	260/52 -47°
RAP	used from 848 nm out; 83 nm from the line		180/23 12°	200/38 13°	210/38 6°	220/28 -10°	230/34 -21°	230/37 -36°	250/52 -38°	250/59 -46°
DIK	used from 898 nm out; 81 nm from the line		150/24 7°	200/38 6°	220/53 0°	230/51 -9°	230/49 -21°	240/37 -37°	240/47 -44°	250/65 -48°
MLS	used from 948 nm out; 55 nm from the line		150/23 2°	190/29 4°	210/44 2°	220/32 -10°	210/36 -21°	200/48 -37°	230/63 -40°	240/71 -47°
BIL	used from 1098 nm out; 34 nm from the line		080/13	180/9 -2°	210/38 0°	220/51 -11°	210/46 -22°	210/58 -35°	230/73 -39°	230/72 -45°
GTF	used from 1197 nm out; 54 nm from the line		070/11	080/15 -7°	110/19 -9°	190/25 -14°	200/34 -23°	200/54 -39°	220/66 -40°	220/77 -44°
GPI	used from 1347 nm out; 76 nm from the line		070/19 -5°	100/16 -7°	080/10 -8°	130/8 -19°	170/37 -28°	200/50 -40°	210/43 -40°	220/41 -42°
LWS	used from 1397 nm out; 75 nm from the line	070/10	080/12 -2°	030/12 -6°	080/7 -10°	170/34 -21°	160/46 -32°	200/33 -35°	220/22 -35°	230/18 -38°
GEG	used from 1447 nm out; 38 nm from the line		080/16 -2°	050/17 -7°	080/9 -10°	190/33 -21°	180/31 -32°	L/V -35°	L/V -37°	270/8 -40°
YKM	used from 1597 nm out; 50 nm from the line	070/10	040/15 -1°	020/27 -8°	030/25 -13°	020/48 -20°	010/83 -27°	010/77 -37°	010/49 -40°	350/14 -41°
SEA	used from 1647 nm out; 25 nm from the line	050/7	050/11 1°	050/12 -5°	030/31 -7°	010/61 -15°	010/69 -26°	360/73 -40°	360/62 -47°	330/21 -43°

The weather now: both ends and the airports along the way public airports with a weather report within 25 nm of the line, one for each stretch

Airport	Where	Conditions	Wind	Visibility	Ceiling	Elevation	Reported
DAY Dayton, OH	departure	marginal VFR Sky: overcast at 1,400 feet	from the west (280°) at 4 knots	10+ mi	1,400 ft	1,009 ft	12:56 am EDT (04:56 UTC)
GUS Peru, IN	100 nm out, 1 nm south of the line, tower	VFR	from the south-southeast (160°) at 5 knots	10+ mi	none	810 ft	04:55 UTC
DBQ Dubuque, IA	329 nm out, 6 nm northeast of the line, tower	VFR	from the south-southwest (200°) at 8 knots	10+ mi	none	1,076 ft	04:53 UTC
ALO Waterloo, IA	399 nm out, 16 nm southwest of the line, tower	VFR	from the south (170°) at 8 knots	10+ mi	none	873 ft	04:54 UTC
MJQ Jackson, MN	529 nm out, 4 nm north of the line	VFR	from the south (180°) at 6 knots	10+ mi	none	1,445 ft	04:55 UTC
HON Huron, SD	679 nm out, 3 nm south of the line	IFR Sky: overcast at 700 feet	from the north-northwest (340°) at 9 knots	10+ mi	700 ft	1,288 ft	04:55 UTC
RPX Roundup, MT	1128 nm out, 5 nm north of the line	no report just now				3,490 ft
MSO Missoula, MT	1357 nm out, 7 nm southwest of the line, tower	marginal VFR Sky: scattered clouds at 800 feet, a broken layer at 1,600 feet, overcast at 5,000 feet	calm	10+ mi	1,600 ft	3,205 ft	05:07 UTC
GEG Spokane, WA	1507 nm out, 21 nm north of the line, tower	VFR Sky: a few clouds at 8,000 feet, scattered clouds at 12,000 feet	from the north-northeast (030°) at 8 knots	10+ mi	none	2,385 ft	04:53 UTC
MWH Moses Lake, WA	1577 nm out, 10 nm south of the line, tower	VFR Sky: overcast at 9,000 feet	from the northwest (310°) at 4 knots	10+ mi	9,000 ft	1,188 ft	04:52 UTC
SEA Seattle, WA	destination	VFR	from the east (090°) at 6 knots	10+ mi	none	432 ft	9:53 pm PDT (04:53 UTC)

The highest airport on this list sits at 3,490 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.

At SEA when you get there the forecast at the estimated arrival, 12:11 pm PDT (19:11 UTC)

Wind from the west at 6 knots, visibility more than 6 miles, clear skies VFR

The whole forecast for SEA

From Sun 8:00 pm PDT (03:00 UTC): wind from the north at 6 knots, visibility more than 6 miles, clear skies
From Mon 3:00 am PDT (10:00 UTC): wind from the southeast at 4 knots, visibility more than 6 miles, patches of fog, clear skies
From Mon 9:00 am PDT (16:00 UTC): wind from the south-southeast at 4 knots, visibility more than 6 miles, clear skies
From Mon 11:00 am PDT (18:00 UTC): wind from the west at 6 knots, visibility more than 6 miles, clear skies
From Mon 8:00 pm PDT (03:00 UTC): wind from the northwest at 5 knots, visibility more than 6 miles, scattered clouds at 25,000 feet

The forecast for DAY, the departure

From Sun 8:00 pm EDT (00:00 UTC): wind from the northwest at 6 knots, visibility more than 6 miles, overcast at 800 feet
From Mon 12:00 am EDT (04:00 UTC): wind from the west-northwest at 4 knots, visibility 5 miles, mist, scattered clouds at 600 feet
From Mon 5:00 am EDT (09:00 UTC): wind from the west at 3 knots, visibility 2 miles, mist, scattered clouds at 200 feet
At times between Mon 6:00 am EDT (10:00 UTC) and 9:00 am EDT (13:00 UTC): visibility ¼ mile, fog, sky obscured at 200 feet
From Mon 10:00 am EDT (14:00 UTC): wind from the south-southwest at 8 knots, visibility more than 6 miles, scattered clouds at 25,000 feet
From Mon 1:00 pm EDT (17:00 UTC): wind from the south-southwest at 10 knots, visibility more than 6 miles, scattered clouds at 25,000 feet

Temporary flight restrictions on the line or within 25 nm of it

No temporary flight restriction on or near this route right now.

Daylight

Sunset at DAY 7:02 pm EDT (23:02 UTC), at SEA 6:27 pm PDT (01:27 UTC) (civil twilight ends 6:58 pm PDT (01:58 UTC)).

Each restriction opens the FAA's own page with the exact area, heights and times. Ordinary notices to air missions (closed runways, lights out) are not shown: the FAA's notice search is not open to sites like this one at this time.

Radar and forecast charts for the regions crossed government pictures, the latest each time the page loads

Radar now, the central Great Lakes · loop National Weather Service

Radar now, the upper Mississippi valley · loop National Weather Service

Radar now, the northern Rockies · loop National Weather Service

Radar, the whole country · loop National Weather Service

Surface analysis now Weather Prediction Center

Forecast chart, 12 hours ahead Weather Prediction Center

Forecast chart, 24 hours ahead Weather Prediction Center

Sources: the Aviation Weather Center's data service (SIGMETs, AIRMETs, graphical AIRMETs, pilot reports, winds and temperatures aloft, observations and terminal forecasts), the National Weather Service radar, the Weather Prediction Center's charts, the FAA's temporary flight restriction list and shapes, and the FAA's airport file for the positions, elevations and magnetic variation. Fetched when the page is viewed and kept a few minutes. Each leg is the straight line between its two airports; airways, terrain and airspace are not considered. The airports in detail: James M Cox Dayton International, Seattle-Tacoma International.